/Engine/Source/Runtime/TypedElementFramework/Public/Elements/Interfaces/TypedElementDataStorageInterface.h
Adds a new column to a row. If the column already exists it will be returned instead. If the colum couldn't be added or the column type points to a tag an nullptr will be returned.
void * AddOrGetColumnData ( TypedElementRowHandle Row, const [UScriptStruct](API\Runtime\CoreUObject\UObject\UScriptStruct) * ColumnType )